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Expression of ERG, a specific endothelial cell marker, in the alveolated lung parenchyma is not significantly different in severe asthma (SA). Representative ERG immunostained images (20X) from a control sample (A) and a severe asthma sample (B). The average percent ERG positive nuclei in each sample, quantified using the Aperio ImageScope-embedded algorithm. Data expressed as mean ± SD (D).
